[llvm] [llvm-strip] Remove empty SHT_GROUP sections. (PR #97141)

[James Henderson via llvm-commits]

https://github.com/jh7370 commented:

I think it would be worth a test case where you explicitly remove an empty .group section too, to show that the code handles that successfully (i.e. it doesn't try to remove the same .group section twice and blow up).

https://github.com/llvm/llvm-project/pull/97141